21301075 has 12 divisors (see below), whose sum is σ = 26625280. Its totient is φ = 16904160.

The previous prime is 21301073. The next prime is 21301081. The reversal of 21301075 is 57010312.

It is not a de Polignac number, because 21301075 - 2¹ = 21301073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21301073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180 + ... + 6529.

Almost surely, 2^21301075 is an apocalyptic number.

21301075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21301075 is a deficient number, since it is larger than the sum of its proper divisors (5324205).

21301075 is a wasteful number, since it uses less digits than its factorization.

21301075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6846 (or 6841 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 21301075 is about 4615.3087654024. The cubic root of 21301075 is about 277.2046474764.

Adding to 21301075 its reverse (57010312), we get a palindrome (78311387).

The spelling of 21301075 in words is "twenty-one million, three hundred one thousand, seventy-five".